// the entry point for all C# programs. The Main method states what the class does when executed.
static void Main(string[] args)
{
#region part1 - Very short presentation, Hello World, class structure, using position in file
Console.WriteLine("Part 1: \n");
// my first program in C#
// WriteLine is a method of the Console class defined in the System namespace. This statement causes the message "Hello, World!" to be displayed on the screen.
Console.WriteLine("Hello World");
// This makes the program wait for a key press and it prevents the screen from running and closing quickly when the program is launched from Visual Studio.
Console.ReadKey();
#endregion
#region part2 - Class, members, methodes, constructors, override ToString()
Console.WriteLine("\n\n\nPart 2: \n");
// initialization methods:
// 1:
var rectangle1 = new Fundamentals2016.Part2.Rectangle();
rectangle1.Length = 10;
rectangle1.Width = 6;
// 2:
var rectangle2 = new Fundamentals2016.Part2.Rectangle(12, 8);
// 3:
var rectangle3 = new Fundamentals2016.Part2.Rectangle();
rectangle3.InitializeWithCustomValues();
// 4:
var rectangle4 = new Fundamentals2016.Part2.Rectangle();
rectangle4.InitializeWithSpecificValues(20, 15);
// call methods:
Console.WriteLine(rectangle1.GetArea());
rectangle1.Display();
Console.WriteLine(rectangle1.ToString());
Console.ReadKey();
Console.WriteLine(rectangle2.ToString());
Console.ReadKey();
Console.WriteLine(rectangle3.ToString());
Console.ReadKey();
Console.WriteLine(rectangle4.ToString());
Console.ReadKey();
#endregion
#region part3 - Value type, Referance type, boxing, unboxing, Dynamic type, static methodes, convertions, constant variables, readonly variables
Console.WriteLine("Size of int: {0}", sizeof(int));
Console.ReadKey();
// boxing & unboxing
object obj;
obj = 100; // this is boxing
int unboxObj = (int)obj; // this is unboxing
// cast double to int.
double nr1 = 5673.74;
int nr2;
nr2 = (int)nr1;
Console.WriteLine(nr2);
Console.ReadKey();
// dinamyc type: (with static methode)
Console.WriteLine();
DynamicTypes.DynamicTypesExample();
// string conversion: (with static methode)
Console.WriteLine();
StringConversion.ConvertValues();
// working with constants:
Console.WriteLine("\n");
Console.WriteLine("Enter Radius: ");
var radius = Convert.ToDouble(Console.ReadLine());
var circle = new CircleExampleWithConstants(radius);
circle.DisplayArea();
#endregion
#region part4 - enums, if (?), ??, switch, inheritance, interface, IComparable, generic methods, overloading, polymorphism
var triangle = new Triangle(3, 4, 5);
var rectangle = new Fundamentals2016.Part4.Rectangle(2, 6);
var regularPentagon = new RegularPentagon(4);
Console.WriteLine("\n\n " + triangle.ToString() + ": Perimetru: " + PoligonHelper.GetPerimeter(triangle) + " Arie: " + PoligonHelper.GetAria(triangle));
Console.WriteLine("\n\n " + rectangle.ToString() + ": Perimetru: " + PoligonHelper.GetPerimeter(rectangle) + " Arie: " + PoligonHelper.GetAria(rectangle));
Console.WriteLine("\n\n " + regularPentagon.ToString() + ": Perimetru: " + PoligonHelper.GetPerimeter(regularPentagon) + " Arie: " + PoligonHelper.GetAria(regularPentagon));
Console.ReadKey();
// polimophism:
Poligon p = new Fundamentals2016.Part4.Rectangle(2, 6);
Console.WriteLine("\n\n " + p.GetType() + ": Perimetru: " + p.CalculatePerimeter());
Console.ReadKey();
#endregion
#region part5 - using, read from file, write in file, exceptions, custom exception, threads, async await
var file = new WorkWithFileExample("E:\\ZTH\\TextFile.txt");
file.ReadContent();
file.WriteContent();
// custom exception:
Console.WriteLine("\n");
Console.WriteLine("Enter a number: ");
var number = Convert.ToDouble(Console.ReadLine());
if (number < 0)
{
//throw new NegativeNumberException();
throw new NegativeNumberException("Negative number is not allowed!");
}
Console.ReadKey();
// events:
// threads, async, await:
#endregion
}